@import url('https://fonts.googleapis.com/css2?family=Palatino:wght@400;700&family=Open+Sans:wght@400;600;700&display=swap');

:root {
    /* COL Core Colors Only - As per Brand Guidelines */
    --col-purple: #463688;
    --col-gold: #9f915d;
    --col-purple-20: rgba(70, 54, 136, 0.2);
    --col-purple-10: rgba(70, 54, 136, 0.1);
    --col-gold-20: rgba(159, 145, 93, 0.2);
    --col-gold-10: rgba(159, 145, 93, 0.1);
    --col-grey: #6e6f6e;
    --col-black: #000000;
    --col-white: #ffffff;
    
    /* Typography */
    --font-serif: 'Palatino', 'Times New Roman', serif;
    --font-sans: 'Open Sans', 'Helvetica Neue', Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--col-white);
    color: var(--col-black);
    line-height: 1.6;
}

/* Header Section */
.header {
    background: var(--col-white);
    border-bottom: 1px solid #eee;
    padding: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.col-logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-shield {
    width: 50px;
    height: 62px;
    background: var(--col-purple);
    border-radius: 6px 6px 15px 15px;
    position: relative;
    border: 2px solid var(--col-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.logo-shield::before {
    content: 'C·O·L';
    color: var(--col-white);
    font-size: 10px;
    font-weight: bold;
    letter-spacing: 1px;
}

.logo-shield::after {
    content: '📚';
    font-size: 14px;
    margin-top: 3px;
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--col-purple);
    letter-spacing: 1px;
}

.logo-text .of {
    font-style: italic;
    font-weight: normal;
}

.tagline {
    font-size: 0.85rem;
    color: var(--col-gold);
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--col-purple) 0%, var(--col-gold) 100%);
    color: var(--col-white);
    padding: 60px 0;
    text-align: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 3rem;
    margin-bottom: 15px;
    font-weight: bold;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.95;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Filter Section */
.filter-section {
    margin-bottom: 40px;
    padding: 30px;
    background: var(--col-white);
    border: 1px solid #eee;
    border-radius: 8px;
}

.filter-section h2 {
    font-family: var(--font-serif);
    color: var(--col-purple);
    margin-bottom: 20px;
    font-size: 1.5rem;
    font-weight: bold;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    background: var(--col-white);
    color: var(--col-purple);
    border: 2px solid var(--col-purple);
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 0.9rem;
}
.filter-btn:hover, .filter-btn.active {
    background: var(--col-purple);
    color: var(--col-white);
}

.filter-btn:focus {
    outline: 2px dashed var(--col-gold);
    outline-offset: 2px;
}

.count-badge {
    background: var(--col-purple);
    color: var(--col-white);
    border-radius: 12px;
    padding: 2px 6px;
    margin-left: 6px;
    font-size: 0.75rem;
}

.total-books {
    margin-top: 15px;
    font-weight: 600;
    text-align: center;
}


/* Catalog Grid */
.catalog-section h2 {
    font-family: var(--font-serif);
    color: var(--col-purple);
    margin-bottom: 30px;
    font-size: 2rem;
    font-weight: bold;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.resource-card {
    /* background: var(--col-white); */ /* Moved to .resource-card-link */
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: row;
    /* align-items: flex-start; */ /* Handled by flex-direction: column */
    /* gap: 20px; */ /* Handled by flex-direction: column */
    flex-direction: column; /* Default to column layout */
}

.resource-card-link {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    height: 100%; /* Make the link fill the card */
    background: var(--col-white); /* Apply background to the link */
    border-radius: 8px; /* Match card border-radius */
}

.resource-card-content {
    flex-grow: 1;
    min-height: 220px;
}

.resource-card:hover {
    box-shadow: 0 8px 25px rgba(70, 54, 136, 0.15);
    transform: translateY(-2px);
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--col-purple), var(--col-gold));
    border-radius: 8px 8px 0 0;
}

.resource-thumbnail {
    width: 100%; /* Make thumbnail fill width in column layout */
    height: auto;
    border-radius: 6px 6px 0 0; /* Rounded top corners */
    margin-bottom: 0;
    object-fit: cover;
    flex-shrink: 0;
}

.subject-tag {
    display: inline-block;
    background: var(--col-gold-10);
    color: var(--col-gold);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 10px;
    border: 1px solid var(--col-gold-20);
}

.resource-card h3 {
    font-family: var(--font-serif);
    color: var(--col-purple);
    font-size: 1.2rem;
    margin-bottom: 10px;
    line-height: 1.3;
    font-weight: bold;
}

.resource-card p {
    color: var(--col-grey);
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 0.9rem;
    flex-grow: 1;
}

.metadata {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
    font-size: 0.85rem;
}

.metadata-item {
    color: var(--col-grey);
}

.metadata-item strong {
    color: var(--col-black);
    font-weight: 600;
}

.license-badge {
    background: var(--col-purple-10);
    color: var(--col-purple);
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid var(--col-purple-20);
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--col-purple);
    color: var(--col-white);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    margin-top: auto;
    align-self: flex-start; /* Keep button aligned left */
}

.card-link:hover {
    background: var(--col-gold);
    transform: translateX(3px);
}

/* Footer */
.footer {
    background: var(--col-purple);
    color: var(--col-white);
    padding: 40px 0;
    margin-top: 60px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo .logo-text {
    color: var(--col-white);
    font-size: 1.3rem;
}

.footer-logo .tagline {
    color: var(--col-gold);
    font-size: 0.9rem;
}

.footer p {
    opacity: 0.9;
    margin-bottom: 10px;
}

.footer-contact {
    margin-top: 20px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .filter-buttons {
        justify-content: center;
    }
    
    .catalog-grid { /* Adjust for smaller screens to allow 2 columns if possible */
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }

    .resource-card {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .resource-thumbnail {
        width: 100%;
        margin-bottom: 15px;
    }

    .card-link {
        align-self: stretch;
        justify-content: center;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 40px 0;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .main-content {
        padding: 20px 15px;
    }
    
    .filter-section {
        padding: 20px;
    }
}